42CrMo High-Strength Alloy Structural Seamless Steel Pipe for Industrial Applications

Model NO.
42CrMo
Shape
Pipe
Surface Treatment
Oil Application and Phosphating
Special Use
High-strength Steel Plate
C
0.38~0.45%
Si
0.17~0.37%
Mn
0.50~0.80%
Cr
0.90~1.20%
Mo
0.15~0.25%
P
≤0.035
S
≤0.035
Heat Treatment Condition
Quenching + High-Temperature Tempering
Tensile Strength (RM)
≥1080 MPa
Yield Strength (Rel)
≥930 MPa
Strain (a)
≥12%
Cross-Sectional Contraction Rate (Z)
≥45%
Impact Energy (Akv, at Room Temperature)
≥39j
Brinell Hardness (Hbw)
280~320
Trademark
evergrowing
Origin
Jiangsu, China
HS Code
7304599090
Production Capacity
50000ton/Years
Reference Price
$ 697.50 - 706.50
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Product Description

42CrMo Alloy Structural Seamless Steel Pipe: Detailed Explanation of Chemical and Physical Properties
42CrMo is a typical representative of medium-carbon chromium-molybdenum alloy structural steel. Its seamless steel pipes, due to their excellent quenchability, high strength and fatigue resistance, are widely used in high-load, strong impact and medium-high temperature working conditions (such as hydraulic cylinders, wind turbine main shafts, and construction machinery transmission shafts, etc.). The following is presented from two aspects: chemical characteristics (composition and functions) and physical characteristics (mechanical, thermal, and basic physical properties). The data comply with the requirements of China's "Alloy Structural Steel" (GB/T 3077-2015) and associated standards for seamless steel pipes (such as GB/T 8162 for structural use and GB/T 8163 for fluid transportation use).
Specification
The chemical and physical properties of 42CrMo alloy structural seamless steel pipes are highly suitable for industrial scenarios with high load, impact resistance, and medium to high temperatures. The core logic is as follows:
Chemically:
The combination of Cr and Mo synergistically improves hardenability and high - temperature stability.
C ensures basic strength, and low impurities (P, S) avoid the risk of brittleness;
Physically: High tensile/yield strength can bear heavy loads,
sufficient toughness can resist impacts,
a uniform seamless structure eliminates weak points,
 and a moderate coefficient of thermal expansion ensures dimensional stability.
Typical applications include:
In the machinery field: Hydraulic cylinder barrels, wind turbine main shafts, gear shafts, bearing sleeves;
In the energy field: Medium - high - pressure oil pipes,
 boiler water - wall tubes, power - station drive shafts;
In construction machinery:
Excavator stick cylinders, crane telescopic boom steel pipes.
42CrMo High-Strength Alloy Structural Seamless Steel Pipe for Industrial Applications
Core Definitions & Key Characteristics
To understand this product, let's break down its key attributes:
Alloy structural steel: Based on carbon steel, it adds a small amount of alloy elements (e.g., Cr, Mo, Ni, Mn) to adjust mechanical properties (e.g., tensile strength, impact toughness) and adapt to specific working conditions (e.g., high temperature, low temperature, corrosion).Seamless pipe: Produced by piercing a solid steel billet into a hollow tube blank, then rolling/drawing it into shape—no welding seams. This eliminates the "weak point" of welds, making it more resistant to pressure, fatigue, and cracking.Structural use: Primarily designed for load-bearing or pressure-transmitting components (e.g., machine shafts, hydraulic cylinders, high-pressure pipelines), rather than decorative or low-stress scenarios.
42CrMo High-Strength Alloy Structural Seamless Steel Pipe for Industrial Applications
42CrMo High-Strength Alloy Structural Seamless Steel Pipe for Industrial Applications
42CrMo High-Strength Alloy Structural Seamless Steel Pipe for Industrial Applications
right elevation
left elevation
front elevation
Thermal indicators
units
Reference value (at normal temperature or specific temperature)
significance of application
melting point
℃
1420~1450
Higher than ordinary carbon steel tubes (about 1400℃), suitable for high-temperature heating molding (such as hot piercing of seamless tubes, hot rolling process)
Thermal conductivity (λ)
W/(m·K)
50(20℃);38(500℃)
The thermal conductivity decreases with the increase in temperature, indicating that heat dissipation is slower at high temperatures. Therefore, during heat treatment, the rate of temperature rise and drop should be controlled to avoid excessive internal stress. At the same time, it is suitable for medium and high-temperature working conditions that require insulation (such as boiler pipes at 400-500℃)
Coefficient of linear expansion (α)
10(-6)/℃
11.5(20~100℃);13.5(20~500℃)
When the temperature rises, the expansion rate is relatively low. At high temperatures, the dimensional stability is good, reducing the structural deformation caused by thermal expansion and contraction (such as the main shaft of a high-precision machine tool)
Specific heat capacity (c)
J/(kg·K)
470(20℃)
The specific heat capacity is moderate, and during heat treatment, the energy consumption can be controlled, making it convenient to achieve uniform temperature control in batch production.
Density (ρ)
kg/m³
7850
Similar to ordinary carbon steel, it belongs to "medium-density metals", achieving a balance between strength and weight. It is suitable for structural components with no extreme requirements for weight (such as components for construction machinery, rather than lightweight components for aviation).
Resistivity (ρ)
Ω·mm²/m
0.18(20℃)
The resistivity is higher than that of pure iron (approximately 0.10), making it unsuitable as a conductive material. It is mainly used for structural support rather than for electrical purposes.
42CrMo High-Strength Alloy Structural Seamless Steel Pipe for Industrial Applications
After Sales Service
Standard Warranty: 12 months or 2,000 operating hours (whichever comes first).
Extended Warranty: Optional coverage up to 36 months.
Global Support: 24/7 technical assistance and spare parts supply.
Training: On-site or remote operation/maintenance training.
Company Profile
42CrMo High-Strength Alloy Structural Seamless Steel Pipe for Industrial Applications
Evergrowing Resources Co. Ltd.
Evergrowing Resources Co., Limited was set up on 2016. But we have our best team who worked in steel material business and services more than 15years. And we have build our good cooperation with most of steel mills in China, also with some good mills on other countries.
Our global experience allow us to connect customer and supplier all over the world. And we are the leader in our major international market all the time.
42CrMo High-Strength Alloy Structural Seamless Steel Pipe for Industrial Applications
Why Choose Us?
Other Products
Our Aim
To provide high quality material and services to all customers.
Competitive price: try best to make best offer 
Top quality: 100% comply with customer's standard
JIT delivery: Delivery on time for each order.
One station purchase: we try to supply the material with different condition to our customers.
After service: Response on any quality question and etc.
Our main products
Tool Steel: Carbon Tool Steel,
Alloy Tool Steel, High-speed Tool Steel…
Structural Steel:
 Carbon Structural Steel,
Alloy Structural Steel…
Shape: Round, Square,
hollow, flat and etc.
FAQ
Q: What’s the lead time for orders?
A: Standard models ship in 15–30 days; customized units require 30–45 days.
Q: Do you provide after-sales service overseas?
A: Yes, we have partnered service centers in key regions.
Q: Can I request a customized bucket size?
A: Absolutely! We offer tailored attachments.
Q: What documents do you provide for export?
A: Full export package (Commercial Invoice, Packing List, Bill of Lading, COC, etc.).
Q: How do I place an order?
A: Contact us via email/phone for a quote, then confirm with a PO.

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